CN104608988A - Zipper pull and packaging container with zipper pull - Google Patents
Zipper pull and packaging container with zipper pull Download PDFInfo
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- CN104608988A CN104608988A CN201510019377.6A CN201510019377A CN104608988A CN 104608988 A CN104608988 A CN 104608988A CN 201510019377 A CN201510019377 A CN 201510019377A CN 104608988 A CN104608988 A CN 104608988A
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Abstract
The invention relates to a zipper pull for packaging a container. The zipper pull sequentially comprises an aluminum foil layer and an MPE/ LDPE/ LDPE mixture layer. The invention further relates to a packaging container. The packaging container comprises a packaging container main body. The packaging container main body comprises an opening part which is arranged on the top of the container and used for pour-out of food. The opening part is covered with the zipper pull, sealing is carried out from the upper portion of the zipper pull and along the periphery of the opening part, the opening part is covered with an inner belt from the lower portion, and the lower surface of the periphery of the opening part is combined with the inner surface of the zipper pull in a welding mode. The zipper pull is good in opening effect.
Description
Technical field
The present invention relates to a kind of packing container pulling-on piece, also relate to the method manufacturing this pulling-on piece and the packing container using this pulling-on piece.
Background technology
Packing container for food has packing container main body, be arranged on container top for pouring out the peristome of food, the shedding motion such as mouth of pipe, lid or cap and pulling-on piece or suction pipe.Fig. 2 shows an example of the packing container sealed with pulling-on piece 4.This packing container 1 has main body 2 and is arranged on the peristome 3 of container top for food.
Fig. 1 is the cutaway view of the peripheral part representing peristome and peristome.In order to sealed open portion 3, peristome 3 is covered by pulling-on piece 4, and seals along the periphery 3a of peristome 3 above pulling-on piece 4.In addition, peristome 3 is from being covered by interior band 5 below, and the lower surface of the periphery 3a of peristome 3 and the inside face combination fused with one another of pulling-on piece 4, to seal.
In order to pour out food, the sheet of the unsealing part of pull-up pulling-on piece 4, the part of interior band 5 near the marginal portion of peristome disconnects, and with peel-open tab 4, disconnects the sealing of peristome 3.In above process, it is extremely important whether packing container easily tears, and when namely peeling off pulling-on piece, needs to obtain good unlatching effect, and irregular and tearing of having fiber to drop can contaminated food products.
Summary of the invention
One aspect of the present invention provides pulling-on piece, and this pulling-on piece at least comprises the layer of following order: aluminium foil layer, MPE/LDPE/LLDPE mixture layer.
The quality of described MPE accounts for the 20-50% of MPE/LDPE/LLDPE mixture layer.
Described pulling-on piece also comprises LDPE/LLDPE mixture layer, and described LDPE/LLDPE mixture layer is arranged between described aluminium foil layer, MPE/LDPE/LLDPE mixture layer.
Described pulling-on piece also comprises LLDPE layer, described in be arranged between described aluminium foil layer, MPE/LDPE/LLDPE mixture layer.
Described pulling-on piece also comprises LLDPE layer, described in be arranged between described aluminium foil layer, LDPE/LLDPE mixture layer.
In described MPE/LDPE/LLDPE mixture layer, the weight ratio of LLDPE is greater than the weight ratio of LLDPE in LDPE/LLDPE mixture layer.
The another aspect of the application relates to a kind of method manufacturing pulling-on piece, comprises the following steps:
The following composition of order co-extrusion pressure according to as described below: aluminium foil layer, MPE/LDPE/LLDPE mixture layer; Or aluminium foil layer, LDPE/LLDPE mixture layer, MPE/LDPE/LLDPE mixture layer; Or aluminium foil layer, LLDPE layer, MPE/LDPE/LLDPE mixture layer or aluminium foil layer, LLDPE layer, LDPE/LLDPE mixture layer, MPE/LDPE/LLDPE mixture layer, these layers are according to said sequence lamination.The raw material used in said method is conventional raw material, has no special requirements, and each step lamination can carry out, to Fabricating machinery also without particular/special requirement under substantially identical technological condition.Also the mode of blowing can be adopted to process preparation.
The another aspect of the application relates to a kind of packing container using above-mentioned pulling-on piece, described packing container comprises packing container main body, described packing container main body comprises and is arranged on container top for pouring out the peristome of food, described peristome is covered by pulling-on piece, and seal along the periphery of peristome above pulling-on piece, peristome is from being covered by interior band below, the lower surface of the periphery of peristome and the combination fused with one another of the inside face of pulling-on piece, described pulling-on piece comprises the layer of following order: aluminium foil layer, MPE/LDPE/LLDPE mixture layer, the quality of described MPE accounts for the 20-50% of MPE/LDPE/LLDPE mixture layer.
Be easier to understand the above-mentioned of the application and other features, aspect and advantage with reference to following detailed description.
Accompanying drawing explanation
Fig. 1 is the cutaway view of the neighbouring part representing peristome and peristome.
Fig. 2 is the transparent view of the example representing packing container.
Nomenclature
1 packing container
2 packing container main bodys
3 peristomes
4 pulling-on pieces
Band in 5
3a peristome periphery
Detailed description of the invention
The detailed description of the following preferred implementation method of the present invention of participation in the election and the embodiment comprised more easily can understand present disclosure.Can mention a large amount of term in following specification sheets and claims, these terms are defined as following implication.
Singulative comprises plural number and object is discussed, unless clearly indicated in addition in context.
" optional " or " optionally " refers to that the item that describes thereafter or event can occur or not occur, and this description comprises situation that event occurs and the situation that event does not occur.
Approximate term in specification sheets and claims is used for modifying quantity, represents that the present invention is not limited to this concrete quantity, also comprises close to this quantity acceptable and can not cause the part of the correction of the change of relevant basic function.Accordingly, modify a numerical value with " approximately ", " about " etc., mean and the invention is not restricted to this exact numerical.In some example, approximate term may correspond to the precision of the instrument measuring numerical value.In present specification and claims, scope limits and can combine and/or exchange, if do not illustrate that these scopes comprise contained all subranges therebetween in addition.
" polymer blend " refers to the physical mixture of homopolymer, copolymer or homopolymer that two or more molecular structure is different and copolymer.The contact of covalent bond is not had between the large molecule of general two components.The mixing of poly-mer is endothermic process, is by the heterogeneous system of a kind of polymer dispersed in another kind of poly-mer.Blended object to be prepared in polymeric material that is that some performance improves to some extent or that have special performance.Polymer blend is a kind of multiphase polymer occurred the earliest.As far back as 20 beginnings of the century, just there is the patent report by blended obtained shock proof polystyrene.Be blended in technique comparatively simple, the range of choice of component is comparatively large, can make the new material with property easily, so development is very fast.
The term " LDPE " used in the application, refers to Low Density Polyethylene, and the term " LLDPE " used in the application refers to linear low density polyethylene.
Term used in this application " MPE " is metallocene PE, is take metallocene as the polyethylene that catalyst synthesizes.Therefore, performance has from the PE that traditional Ziegler-Natta catalyst is polymerized different significantly.
Pulling-on piece, this pulling-on piece comprises the layer of following order: aluminium foil layer, MPE/LDPE/LLDPE mixture layer, and the quality of described MPE accounts for the 20-50% of MPE/LDPE/LLDPE mixture layer.Experiment proves, 20-50% is a ratio with good operation of opening/locking effect, and after LDPE and LLDPE is mixed, mixture layer has general heat sealability.
As a preferred technical scheme, pulling-on piece also comprises LDPE/LLDPE mixture layer, and described LDPE/LLDPE mixture layer is arranged between described aluminium foil layer, MPE/LDPE/LLDPE mixture layer.LDPE/LLDPE mixture layer as the buffering of aluminium foil layer, MPE/LDPE/LLDPE mixture layer, can effectively improve unlatching effect.
As a preferred technical scheme, pulling-on piece also comprises LLDPE layer, described in be arranged between described aluminium foil layer, MPE/LDPE/LLDPE mixture layer.After adding LLDPE layer, open effect better excellence, obtain from the inside to the outside, LLDPE concentration several layers of diminishing gradually, improve unlatching effect.
As a preferred technical scheme, pulling-on piece also comprises LLDPE layer, described in be arranged between described aluminium foil layer, LDPE/LLDPE mixture layer.
As a preferred technical scheme, in MPE/LDPE/LLDPE mixture layer, the weight ratio of LLDPE is greater than the weight ratio of LLDPE in LDPE/LLDPE mixture layer.The program can obtain more excellent unlatching effect.
Adopt above-mentioned preferred technical scheme, by experiment, can prove, preferred scheme can obtain breaking the better pulling-on piece of performance, and be more easy to get neat fiberless fracture port.
Prevent from the process of tearing, cause film to peel off, film occurs and remains or the problem such as wire drawing and the appearance poor of release surface.Preferably, the binder resin being applicable to above-mentioned condition selects to have the hyperbranched type nano modified polyurethane adhesion agent (CPUAD) of ad hoc structure, and it is prepared by following steps:
(1) by acid alcohol mol ratio 1:(1.0 ~ 1.2) take ternary acid and diatomic alcohol joins in reactor, be warming up to 140 DEG C, add the catalyst accounting for reaction system total mass 2 ‰, stir under nitrogen protection condition;
The structure of described ternary acid is as follows:
Described diatomic alcohol is propylene glycol;
(2) when tower top cut point is less than 80 DEG C, when starting to be warming up to temperature of reaction 210 DEG C gradually, under nitrogen protection condition, 2 ~ 3h is incubated;
(3) at temperature of reaction 210 DEG C, vacuumize gradually from low to high, be less than 1mg KOH/g to product acid number and obtain qualified polyester;
(4) polyester after vacuum dewatering taking the required number of formula joins in reactor, is warming up to 80 DEG C;
(5) add the chain extender through distillation dehydration of required number, mix;
(6) adding the isocyanates of required number, stir rapidly, to stirring at need, adding component solvent gradually;
(7) add required number catalyst, under 60 ~ 80 DEG C of conditions, stir 1h;
(8) add nano silicon and the silane coupling agent of the drying process of required number, under 60 ~ 80 DEG C of conditions, stir 1h;
(9) add the polymerization inhibitor of required number, stir 10min;
(10) through inspection, load sebific duct and obtain finished product.
When above-mentioned isocyanates is solid aromatic race isocyanates, add again after need melting in the hot water of 60 ~ 80 DEG C.
This adhesives is used for bonding aluminium foil and resin, to spray or the mode of lamination realizes bonding.
Opening structure is with for pulling-on piece-Nei, because interior band exists at least 5 Rotating fields, pulling-on piece also has 2 Rotating fields, bind strength between each layer obviously should be greater than the disruption characteristic of interior band, in another section of patent of present invention applicant, provide a kind of interior band structure completely newly, interior band has better breaking property, makes fracture port neat without fiber.
The structure of pulling-on piece can adopt the bonding hot sealing layer of adhesives and aluminium foil, but adhesives may make hot sealing layer more easy fracture, thus causes the irregular fracture of hot sealing layer.The present inventor is found by a large amount of experiments, adhesion agent for bonding hot sealing layer and aluminium foil layer is not necessary, the present invention, by improving the peel strength of hot sealing layer, keeps the heat sealability of hot sealing layer, can obtain the neat and fiberless pulling-on piece of fracture port.Adopt the solution of the present invention to breach the conventional thought (namely improving unlatching effect by improving layers cementing power) of those skilled in the art, the peel strength simply increasing hot sealing layer can obtain opens respond well pulling-on piece.
The another aspect of the application relates to a kind of method manufacturing pulling-on piece, comprises the following steps:
The following composition of order co-extrusion pressure according to as described below: aluminium foil layer, MPE/LDPE/LLDPE mixture layer; Or aluminium foil layer, LDPE/LLDPE mixture layer, MPE/LDPE/LLDPE mixture layer; Or aluminium foil layer, LLDPE layer, MPE/LDPE/LLDPE mixture layer or aluminium foil layer, LLDPE layer, LDPE/LLDPE mixture layer, MPE/LDPE/LLDPE mixture layer, these layers are according to said sequence lamination.The raw material used in said method is conventional raw material, has no special requirements, and each step lamination can carry out, to Fabricating machinery also without particular/special requirement under substantially identical technological condition.Also the mode of blowing can be adopted to process preparation.
The another aspect of the application relates to a kind of packing container using above-mentioned interior band.
Described packing container comprises and is arranged on container top for pouring out the peristome of food, described peristome is covered by pulling-on piece, and seal along the periphery of peristome above pulling-on piece, peristome is from being covered by interior band below, the lower surface of the periphery of peristome and the combination fused with one another of the inside face of pulling-on piece, described pulling-on piece comprises the layer of following order: aluminium foil layer, MPE/LDPE/LLDPE mixture layer, and the quality of described MPE accounts for the 20-50% of MPE/LDPE/LLDPE mixture layer.
In one embodiment, the LDPE in the layers such as MPE/LDPE/LLDPE mixture layer can be homopolymer, but condition is the another kind of alpha-olefin that this homopolymer optionally can comprise maximum 5%.Although there are other a small amount of alpha-olefins potentially, LDPE is commonly referred to as Natene.
In one embodiment, the LDPE being suitable for the application can have according to ASTM D1505 measure with lower density: be 0.910 ~ 0.925, preferably 0.918 ~ 0.925; Following fusing point according to ASTM D3418 measures: about 102 DEG C to about 110 DEG C, alternatively from about 102 DEG C to about 106 DEG C, or alternatively from about 106 DEG C to about 110 DEG C; And according to the vicat softening temperature that ASTM D1525 measures: from about 86 DEG C to about 102 DEG C, alternatively from about 92 DEG C to about 102 DEG C.
In one embodiment, the density that can be used for the LLDPE of the application is 0.918 ~ 0.930, preferably 0.919 ~ 0.925.
In one embodiment, the MPE being suitable for the application is the copolymer of the 1-hexene of ethene and about 0.2 % by mole to about 0.5 % by mole.In embodiments, be suitable for the MPE of the application, as MLLDPE, can have according to ASTM D1505 measure with lower density: from about 0.913g/cc to about 0.918g/cc, alternatively from about 0.913g/cc to about 0.915g/cc; Or the following fusing point according to ASTM D3418 measures: from about 112 DEG C to about 120 DEG C, alternatively from about 112 DEG C to about 115 DEG C, or alternatively from about 115 DEG C to about 119 DEG C; Or the following melt index (MI) according to ASTM D1238 measures: from about 0.7g/10min. to about 1.6g/10min., alternatively from about 0.9g/10min. to about 1.3g/10min.; Or the vicat softening temperature according to ASTM D1525 measures: from about 100 DEG C to about 106 DEG C, alternatively from about 100 DEG C to about 103 DEG C, or alternatively from about 103 DEG C to about 106 DEG C.
The thickness of the aluminium foil of pulling-on piece can select 5-100 micron, LLDPE layer 1-20 micron, LDPE/LLDPE mixture layer 1-12 micron, MPE/LDPE/LLDPE mixture layer 8-20 micron.Carry out lamination according to said sequence and obtain pulling-on piece.
The present invention is described in detail referring to several example.
Example 1
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=1:1:1.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively aluminium foil 40 microns of MPE/LDPE/LLDPE mixture layers 25 microns.
Interior band:
Each layer that in preparation, band uses is respectively: the barrier layer that Low Density Polyethylene and linear low density polyethylene weight ratio are the skin of 1/5 blend, Low Density Polyethylene and linear low density polyethylene weight ratio are the interlayer of 5/1, the adhesive phase comprising adhesives (Ad) and ethylene-vinyl alcohol copolymer (EVOH).
Heating and melting resin as above, the resin of fusing is filled with in co-extrusion pressure mould according to the order of Low Density Polyethylene and linear low density polyethylene blend/Low Density Polyethylene and linear low density polyethylene blend/adhesives/ethylene-vinyl alcohol copolymer/adhesive phase/Low Density Polyethylene and linear low density polyethylene blend/Low Density Polyethylene and linear low density polyethylene blend, and is molded into film.Molded multilayer film have the hierarchy comprising LLDPE (layer thickness is 6 microns)/LDPE (layer thickness is 2 microns)/Ad (layer thickness is 5 microns)/EVOH (layer thickness is 7 microns)/Ad (layer thickness is 5 microns)/LDPE (layer thickness is 9 microns)/LLDPE (layer thickness is 6 microns).
Example 2
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=1:2:2.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively aluminium foil 40 microns of MPE/LDPE/LLDPE mixture layers 25 microns.
Interior band is same as Example 1.
Example 3
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=4:3:3.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively aluminium foil 40 microns of MPE/LDPE/LLDPE mixture layers 30 microns.
Interior band is same as Example 1.
Example 4
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
LLDPE layer: fusion index 2.0, density 0.918 g/cm3
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=1:2:2.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, 15 microns, LLDPE layer, MPE/LDPE/LLDPE mixture layer 15 microns.
Interior band is same as Example 1.
Example 5
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
LDPE/LLDPE mixture layer: LDPE/LLDPE=1:1
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=1:2:2.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, 15 microns, LLDPE layer, LDPE/LLDPE mixture layer 10 microns, MPE/LDPE/LLDPE mixture layer 10 microns.
Interior band is same as Example 1.
Example 6
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
LLDPE layer: fusion index 2.0, density 0.918 g/cm3
LDPE/LLDPE mixture layer: LDPE/LLDPE=1:3
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=1:1:1.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, 10 microns, LLDPE layer, LDPE/LLDPE mixture layer 10 microns, MPE/LDPE/LLDPE mixture layer 10 microns.
Interior band is same as Example 1.
Example 7
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=4:1:1.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, MPE/LDPE/LLDPE mixture layer 25 microns.Interior band is same as Example 1.
Example 8
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
LLDPE layer: fusion index 2.0, density 0.918 g/cm3
LDPE/LLDPE mixture layer: LDPE/LLDPE=3:1
MPE/LDPE/LLDPE mixture layer: MPE/LDPE/LLDPE=1:1:1.
LLDPE: fusion index 2.0, density 0.918 g/cm3, MPE: fusion index 1.0, density 0.918 g/cm3, LDPE: fusion index 2.0, density 0.924 g/cm3, above is all mass ratioes.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, MPE/LDPE/LLDPE mixture layer 25 microns.Interior band is same as Example 1.
Comparative example 1
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
LLDPE layer: fusion index 2.0, density 0.918 g/cm3
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, 25 microns, LLDPE layer.Interior band is same as Example 1
Comparative example 2
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
LDPE layer: fusion index 2.0, density 0.924 g/cm3.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, 25 microns, LDPE layer.Interior band is same as Example 1.
Comparative example 3
Pulling-on piece:
Aluminium foil: Eastern Mountain, Tianjin, 40 microns.
MPE layer: fusion index 1.0, density 0.918 g/cm3.
Heating and melting resin as above, each layer of molded multilayer film is respectively 40 microns, aluminium foil, 25 microns, LDPE layer.Interior band is same as Example 1.
measuring method
The pulling-on piece of various types and interior band can be obtained according to the multilayer film obtained in above-mentioned example.Use interior band and the pulling-on piece of these various types, along the lower surface of the peristome that periphery sealing seals with the pulling-on piece of paper container as shown in Figure 2, thus from lower side seals peristome.When opening the pulling-on piece in the above-mentioned example of use to seal off peristome, visually observing the part place of pulling-on piece near the marginal portion of peristome and how to disconnect.When peeling off pulling-on piece, interior band is promptly cut off, and interior band or pulling-on piece do not have a part to leave fiber or fritter, then test passes.On the contrary, if after the disconnection of interior band, a part for pulling-on piece leaves fiber and fritter, then test failure.
Often kind of pulling-on piece all gets 1000 samples, and measures the quantity of wherein qualified samples, and result is as shown in table 1.
Table 1
| Sample | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | To 1 | To 2 | To 3 |
| Qualified % | 81 | 83 | 79 | 95 | 96 | 98 | 95 | 85 | 56 | 59 | 64 |
By the test result that above-mentioned requirements is extremely strict, show, adopt the scheme of MPE/LDPE/LLDPE significantly can reduce the unlatching effect of pulling-on piece, adopt separately any one poly-mer then cannot reach and well open effect.In such scheme, increase and adopt aforesaid adhesives, this adhesives uses aforementioned preparation process to prepare.Example 1-3 can improve qualification rate at least 19%.
Aforesaid example is only illustrative, for explaining some features of feature of the present disclosure.Appended claim is intended to the scope wide as far as possible that requirement it is contemplated that, and the embodiment presented herein is only the explanation of the embodiment of the selection of combination according to all possible embodiment.Therefore, the purpose of applicant is the selectional restriction that appended claim is not illustrated the example of feature of the present invention.And progress in science and technology is not replaced to be formed due to the inaccurate reason of language performance by the possible equivalent considered at present or son, and these changes also should be interpreted as being covered by appended claim in the conceived case.
Claims (8)
1. pulling-on piece, at least comprises the layer of following order: aluminium foil layer, MPE/LDPE/LLDPE mixture layer.
2. pulling-on piece according to claim 1, is characterized in that, the quality of described MPE accounts for the 20-50% of MPE/LDPE/LLDPE mixture layer.
3. pulling-on piece according to claim 1, is characterized in that, described pulling-on piece also comprises LDPE/LLDPE mixture layer, and described LDPE/LLDPE mixture layer is arranged between described aluminium foil layer, MPE/LDPE/LLDPE mixture layer.
4. pulling-on piece according to claim 1, is characterized in that, described described pulling-on piece also comprises LLDPE layer, described in be arranged between described aluminium foil layer, MPE/LDPE/LLDPE mixture layer.
5. pulling-on piece according to claim 3, is characterized in that, described pulling-on piece also comprises LLDPE layer, described in be arranged between described aluminium foil layer, LDPE/LLDPE mixture layer.
6. pulling-on piece according to claim 5, is characterized in that, in described MPE/LDPE/LLDPE mixture layer, the weight ratio of LLDPE is greater than the weight ratio of LLDPE in LDPE/LLDPE mixture layer.
7. the manufacture method of pulling-on piece, comprises the following steps:
Following composition according to order as described below: aluminium foil layer, MPE/LDPE/LLDPE mixture layer; Or aluminium foil layer, LDPE/LLDPE mixture layer, MPE/LDPE/LLDPE mixture layer; Or aluminium foil layer, LLDPE layer, MPE/LDPE/LLDPE mixture layer or aluminium foil layer, LLDPE layer, LDPE/LLDPE mixture layer, MPE/LDPE/LLDPE mixture layer, these layers are according to said sequence lamination.
8. packing container, described packing container comprises packing container main body, described packing container main body comprises and is arranged on container top for pouring out the peristome of food, described peristome is covered by pulling-on piece, and seal along the periphery of peristome above pulling-on piece, peristome is from being covered by interior band below, and the lower surface of the periphery of peristome and the combination fused with one another of the inside face of pulling-on piece, described pulling-on piece is the pulling-on piece in claim 1-6 described in any one claim.
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| CN201510019377.6A CN104608988B (en) | 2015-01-15 | 2015-01-15 | Pulling-on piece and the packing container containing the pulling-on piece |
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| CN201510019377.6A CN104608988B (en) | 2015-01-15 | 2015-01-15 | Pulling-on piece and the packing container containing the pulling-on piece |
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| CN104608988B (en) | 2017-06-23 |
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